Cyclic and spirocyclic ketals comprise ubiquitous structural motifs in polyketide natural products (Figure 1). (1) Often decorated with substituents and a rich array of stereochemistry, the synthesis ...

Rational construction of covalent organic frameworks (COFs) with novel structures still remains a challenge. Herein, we report the designed synthesis of two COFs, 2D-BPTA-COF and 3D-BMTA-COF, starting ...